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<title>Problem 1339. -- [Baltic2008]Mafia -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>1339: [Baltic2008]Mafia</h2><span class=green>Time Limit: </span>10 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>162 MB<br><span class=green>Submit: </span>157&nbsp;&nbsp;<span class=green>Solved: </span>82<br>[<a href='submitpage.php?id=1339'>Submit</a>][<a href='problemstatus.php?id=1339'>Status</a>][<a href='bbs.php?id=1339'>Discuss</a>]</center><h2>Description</h2><div class=content>匪徒准备从一个车站转移毒品到另一个车站,警方准备进行布控. 
对于每个车站进行布控都需要一定的代价,现在警方希望使用最小的代价控制一些车站,使得去掉这些车站后，匪徒无法从原定的初始点到达目标点</div><h2>Input</h2><div class=content>第一行输入N,M代表车站的总个数,及有多少条双向边连接它们.
2<=n<=200 , 1 <=m<=20000.
第二行给出两个数a,b,代表匪徒的出发点及目标点.1<=a,b<=N,a<>b.
再下来有N行,给出对第i个车站进行布控所需要的Money,其不超过10 000 000
再下来M行,用于描述图的结构.</div><h2>Output</h2><div class=content>最少需要多少Money</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>5 6<br />
5 3<br />
2<br />
4<br />
8<br />
3<br />
10<br />
1 5<br />
1 2<br />
2 4<br />
4 5<br />
2 3<br />
3 4</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>5</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search='></a></p></div><center>[<a href='submitpage.php?id=1339'>Submit</a>][<a href='problemstatus.php?id=1339'>Status</a>][<a href='bbs.php?id=1339'>Discuss</a>]</center>﻿<br>

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